A student found a 500 cm3 sample of vinegar. Knowing that vinegar is a solution of ethanoic acid (CH3COOH) and water, this student decided to take a 25.0 cm3 sample, dilute it with 25.0 cm3 of water and then react it with sodium hydroxide. The dilute sample required 37.0 cm3 of 0.850 mol dm–3 sodium hydroxide solution to react entirely with it via the following reaction:

CH3COOH(aq) + NaOH(aq) → NaCH3COO(aq) + H2O(l)

Calculate the concentration of ethanoic acid in the original sample of vinegar.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 12 g

volume = final volume of water - initial volume of water

volume = 18.5 - 14 = 4.5 mL

So we have

[tex]density = \frac{12}{4.5} \\ = 2.66666666...[/tex]

We have the final answer as

Hope this helps you

Answer:the volume of the liquid increases

Explanation:

Answer:

Ionic compounds conduct electricity when dissolved in water, because the dissociated ions can carry charge through the solution. Molecular compounds don't dissociate into ions and so don't conduct electricity in solution.

Protons

Protons are the subatomic particle that determines the identity of an element.

Answer:

Explanation:Protons and neutrons are located in the nucleus of an atom and determine the mass of an atom. Protons have a positive electrical charge and electrons have a negative electrical charge. Atoms that have the same number of protons and electrons do not have an electrical charge.

Answer:

I think they should use a bar graph

Explanation:

Because if they use a bar graph they could mark each of the different kind of fertilizer and they could easily see which one affected it the most, either good or bad, by the looking at the heights of the bars to determine your conclusion.

Hi there!

:bar graph:

If they use a bar graph they could mark each of the different kind of fertilizer and they could see easier to tell which one affected it the most, by looking at the heights of the bars to determine the answers.

Answer: Biogeochemical cycles are usually described with box models.

Explanation: Matter flows through trophic levels and elements are recycled among ecosystems using biogeochemical cycles. As nutrients move through ecosystems, the compounds they form are usually transformed.

Answer:

4 ATOME nitrogen in the formula

There are  20 nitrogen atoms in the chemical formula mentioned.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.They are used to describe the chemical reactions.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

I hope this answer is correct

Explanation:

Element having electronic configuration 1s

2

,2s

2

,2p

6

,3s

2

,3p

6

,3d

10

,4s

2

,4p

6

,4d

10

,5s

2

,5p

3

Answer:

He should use black a light purple brown, tan, blue, and just a tiny bit of pink!

Hope this helps!!

Explanation:

If Johnny wanted to show the brightness of the stars, he should use blue, light blue, yellow, orange, red, and white.

The Milky Way is a huge collection of stars, dust and gas .

Hence , Johnny should use blue, light blue, yellow, orange, red, and white.

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Answer:

Not 100% sure but...

Explanation:

I know that the second, third and fifth one are correct, not sure if there are any more.

Number of atoms : 2.245 x 10²⁴

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

n= 3.73 moles

Number of atoms :

[tex]\tt 3.73\times 6.02\times 10^{23}=\boxed{\bold{2.245\times 10^{24}}}[/tex]

Answer:

GAS .assumes the shape and volume of its container

particles can move past one another    

.compressible

lots of free space between particles

.flows easily

particles can move past one another

LIQUID assumes the shape of the part of the container which it occupies

particles can move/slide past one another

.not easily compressible

little free space between particles

.flows easily

particles can move/slide past one another

SOLID .retains a fixed volume and shape

rigid - particles locked into place

.not easily compressible

little free space between particles

.does not flow easily

rigid - particles cannot move/slide past one another

Answer:

Iodine 131 is an unstable/radioactive isotope of iodine and a normal atom of iodine is stable.

Explanation:

Moles of Fe₂O₃ formed : 1.95

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

[tex]\tt 4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

We find the limiting reactant from the ratio of the mole and the reaction coefficient

Fe ⇒ 3.9 : 4 = 0.975

O ⇒ 4.7 : 3 = 1.56

Because the ratio of Fe is smaller, then Fe becomes the limiting reactant

Reaction

4Fe + 3O₂ ⇒ 2Fe₂O₃

mol Fe₂O₃ from mol of Fe as limiting reactant

mol ratio Fe₂O₃ : Fe = 2 : 4, then mol Fe₂O₃ :

[tex]\tt =\dfrac{2}{4}\times 3.9=\boxed{\bold{1.95}}[/tex]

Explanation:

The Committee has already adopted general comment No. ... Non-discrimination - education must be accessible to all, especially the most ... developmental strategy for its school system.as poverty and discrimination and to provide education of sufficient quality, in a manner that ensures children can benefit from it.

Answer:

i think 15 but dont get mad if not (❁´◡`❁)

Explanation:

Answer:

The answer is 18

Explanation:sorry if im wrong TwT

Answer:

before it evaporated into the air, it was on the Earth...and it could have been contaminated/dirtied. There isn't a process during evaporation that cleans water...you have to purify it yourself.

Explanation:

I think the answer should be titanium, the symbol is Ti.

Answer: Acceleration is when something accels.

Or, in simple terms, when the velocity changes rapidly to a very quick speed.

Hope this answer helps you!

Best of Regards!

Answer:

He will not have hard-boiled eggs for breakfast

Explanation:

The given parameters are;

The elevation at which the base camp of the hiker is located = 5,300 meters

The boiling point of water at the elevation of the base camp = 82°C

The temperature required to cook the raw egg = 100°C

Therefore, we have;

The temperature of the boiling water at the given elevation of the base camp 82°C < The temperature required to cook the raw egg 100°C

Therefore, the eggs will not be hard boiled.

The hiker won't have hard-boiled eggs for breakfast as a result of the

boiling point of water being less than 100⁰C.

The boiling point decreases with an increase in altitude. The hiker was at

5,300 meters above sea level which made the boiling point of water to be

decreased to 82⁰C.

Since the water isn't able to achieve the boiling point of 100⁰C, then the raw

egg won't be hard boiled for breakfast.

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Answer:

Hydrogen... Hydroxide

Explanation:

The number in pH is a logarithm, so when something has a higher pH by 1, it is 100 times more powerful.

Besides, the H in pH is Hydrogen.

Answer:

10 ml

Explanation:

The concentration of the acid solution Chelsea adds to the 25 milliliters of 30% acid solution = 65%

The concentration of the acid solution Chelsea requires = 40%

The volume, X, of the 65% acid solution required is given as follows;

65% × X + 30% × 25 = 40% × (25 + X)

As fractions, we have;

0.65 × X + 0.3 × 25 = 0.4 × (25 + X)

0.65·X + 7.5 = 10 + 0.4·X

0.65·X  - 0.4·X = 10 - 7.5

0.25·X = 2.5

X = 2.5/0.25 = 10

X = 10 ml

The volume of the 65% acid that should be added to create a solution that is 40% acid = 10 ml.

Answer:

[tex]107pg = 107 \times {10}^{ - 12}g =1.07 \times {10}^{ - 10} g\\ because \: pico, \: p = {10}^{ - 12} .[/tex]

Thermal Energy

When a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

Answer:

Explanation:

As described in the question, autism is a disability that arises from a disorder in the central nervous system which is actually characterized by abnormality in the brain structure and then function. Autism is known for symptoms such as challenges with communication and interaction and some obsessive behaviors. While there is generally no known scientific cause for autism but trends have suggested that vaccination in young children causes autism.

However, genes could also be involved in this phenomenon because there have been reports of unusual genetic sequence in children that have autism. Hence, there is a possibility that vaccination actually triggers this genetic sequence which is then expressed as autism in the children.

Please note this isn't a scientific fact and just a possibility as requested in the question.